Carrier Air Conditioner specifications Troubleshooting, To 20 mA Demand Limiting

Page 47

 

100

 

 

 

 

 

 

 

 

50% CAPACITY AT 20 mA

 

 

 

 

 

 

 

 

 

 

 

 

(%)

 

 

 

 

 

 

 

 

 

 

 

 

LOAD

80

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ALLOWABLE.MAX

60

 

 

 

 

 

 

 

 

 

 

 

40

100% CAPACITY AT 4 mA

 

75% CAPACITY AT 12 mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

 

 

 

 

 

0

0

2

4

6

8

10

12

14

16

18

20

 

 

 

 

 

DEMAND LIMIT SIGNAL – 4 - 20 mA INPUT (VOLTS DC)

 

 

Fig. 23 — 4 to 20 mA Demand Limiting

TROUBLESHOOTING

Compressor Protection Control System (CPCS) Board — The compressor protection board con- trols the compressor and compressor crankcase heater.

The ground current protection is provided by the compres- sor board.

The large relay located on the board is used to provide a feedback signal to the Main Base Board.

The operation of the compressor board can be checked us- ing the Service Test procedure. When the Service Test step is turned on, the compressor board is energized. All safeties are continuously monitored. The crankcase heater will be turned off and the compressor contactor will be turned on. The feed- back contacts will close and the Main Base Board (MBB) will read the feedback status.

If the board does not perform properly, use standard wiring troubleshooting procedures to check the wiring for open cir- cuits. Refer to Alarms and Alerts section on page 48 for alarm or alert codes for possible causes for failure.

If a compressor short-to-ground exists, the compressor board may detect the short before the circuit breaker trips. If this is suspected, check the compressor for short-to-ground failures with an ohmmeter. The ground current is sensed with a current toroid (coil) around all 3 or 6 wires between the main terminal block and the compressor circuit breaker(s).

Compressor Ground Current (CGF) Board (30GTN,R and 30GUN,R 130-210, 230A-315A, and 330A/B-420A/B) — One board is used for each cir- cuit of these units. Each board receives input from up to 4 tor- oids wired in series, one toroid per compressor. With 24 v sup- plied at terminals A and B, a current imbalance (compressor ground current) sensed by any toroid causes the NC (normally closed) contacts to open, shutting down the lead compressor in the affected circuit. All other compressors in that circuit shut down as a result. The NC contacts remain open until the circuit is reset by momentarily deenergizing the board using the push- button switch.

If the NC contacts open, it is necessary to remove toroids from the T1-T2 circuit to determine which toroid is causing the trip. The chiller circuit can then be put back on line after the circuit breaker of the faulty compressor is opened. The com- pressor problem can then be diagnosed by normal trouble- shooting procedures.

EXV Troubleshooting — If it appears that the EXV is not properly controlling operating suction pressure or super- heat, there are a number of checks that can be made using

the quick test and initialization features built into the ComfortLink™ control.

Follow the procedure below to diagnose and correct EXV problems.

STEP 1 — CHECK PROCESSOR EXV OUTPUTS — Check EXV output signals at the J6 and J7 terminals of the EXV board.

Turn unit power off. Connect the positive lead of the meter to terminal 3 on connector J6 on the EXV board. Set meter for approximately 20 vdc. Turn unit power on. Enter and enable the Service Test mode. Locate the appropriate EXV under ‘OUTS.’ Select the desired percentage and press Enter to move the valve. The valve will overdrive in both directions when either 0% or 100% are entered. During this time, connect the negative test lead to terminals 1, 2, 4, and 5 in succession. The voltage should fluctuate at each pin. If it remains constant at a voltage or at 0 v, replace the EXV board. If the outputs are cor- rect, then check the EXV.

To test Circuit B outputs, follow the same procedure above, except connect the positive lead of the meter to terminal 3 on connector J7 on the EXV board and the negative lead to termi- nals 1, 2, 4, and 5 in succession.

STEP 2 — CHECK EXV WIRING — Check wiring to EXVs from J6 and J7 connectors on EXV board.

1.Check color coding and wire connections. Make sure that wires are connected to correct terminals at J6 and J7 connectors and EXV plug connections. Check for correct wiring at driver board input and output termi- nals. See Fig. 2-4.

2.Check for continuity and tight connection at all pin terminals.

3.Check plug connections at J6 and J7 connectors and at EXVs. Be sure EXV connections are not crossed.

STEP 3 — CHECK RESISTANCE OF EXV MOTOR WINDINGS — Remove connector at J6 and/or J7 of EXV board and check resistance between common lead (red wire, terminal D) and remaining leads A, B, C, and E. Resistance should be 25 ohms ± 2 ohms. Check all leads to ground for shorts.

STEP 4 — CHECK THERMISTORS THAT CONTROL EXV — Check thermistors that control processor output volt- age pulses to the EXVs. Circuit A thermistor is T7, and circuit B thermistor is T8. Refer to Fig. 9 and 10 for location.

1.Refer to Thermistors section on page 59 for details on checking thermistor calibration.

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Contents Contents Safety ConsiderationsIntroduction ContentsGeneral Unit Nominal Section a Section B 30GTN,R Tons Unit 30GTN,R Major System ComponentsUnit Sizes and Modular Combinations 30GTN,R Unit Sizes and Modular Combinations 30GUN,RThermistor Designations Control Module CommunicationCarrier Comfort Network CCN Interface Output Relay Status SwitchesPage 24 V Control Schematic, Unit Sizes 24 V Control Schematic, Unit Sizes 080-110, 230B-315B CCN LEN Data Communication Port Main Base Board 040-110 130-210 Operating DataThermistor T3 and T4 Locations Compressor Thermistor Locations T7 and T8 Columbia D6451 Manhattan M13402 M64430 Quabik 6130 Regular Wiring Plenum Wiring Alpha 1895 AmericanManufacturer Belden 8205Compressor Protection Control System Module Sizes Stepper Motor 12 VDC CEPL130351 Approx Part Load Data Percent Displacement, Standard UnitsDisplacement Compressors 30GUN,R255A 60 Hz 110, 290B390B 50 Hz 330A/B360B 50 Hz 390B 60 HzB1† A1,B1 A1†,A2,B1 A1*,B1†,B2 Unloaded compressor Two unloaders, both unloaded 190, 290A, 360A/B 170, 270AA1*,B1*,B2 150-210 Required Hardware for Additional UnloadersPumpout Head Pressure ControlFAN Arrangement FAN Relay Normal Control PowerScrolling Marquee Display Service Test See Both main powerGEN.O Test ModesVers Run Status Mode and Sub-Mode DirectorySUB-MODE Keypad Range Item Expansion Comment Entry View StrtOuts Service Test Mode and Sub-Mode DirectorySUB-MODE Keypad Range Item Expansion Comment Entry Test Set Point Mode and Sub-Mode Directory Temperature Mode and Sub-Mode DirectoryPressure Mode and Sub-Mode Directory Crct Inputs Mode and Sub-Mode DirectoryReading and Changing Chilled Fluid Set Point SUB-MODE Keypad Range Item Expansion Comment Entry GEN.ISUB-MODE Keypad Range Item Expansion Comment Entry GEN.O Outputs Mode and Sub-Mode DirectoryConfiguration Mode and Sub-Mode Directory EMM OPT1OPT2 CCNRset 240SUB-MODE Keypad Display Item Expansion Comment Entry Rset Example of Temperature Reset Return Fluid ConfigurationSUB-MODE Keypad Entry Display Item Expansion Comment Rset Example of Configuring Dual Chiller Control Master ChillerExample of Configuring Dual Chiller Control Slave Chiller SUB-MODE Keypad Entry Item Expansion Comment Range Time Example of Compressor Lead/Lag ConfigurationTime Clock Mode and Sub-Mode Directory SUB-MODE Keypad Display Item Expansion Comment Entry OPT2Operating Mode and Sub-Mode Directory Setting an Occupied Time ScheduleOperating Modes Mode no Item Expansion DescriptionExample of Reading and Clearing Alarms Alarms Mode and Sub-Mode DirectoryEntry Expansion Configuring Temperature ResetMode Keypad SUB-MODE ConfigurationRED LED Entry Expansion Configuration DLS2 Configuring Demand LimitTo 20 mA Demand Limiting TroubleshootingPage T051 Alarm and Alert CodesLCW By Control Method Cause Code Alert GENERATED?EWT FSMT173 T153T155 T170T206 T203T204 T205Compressor OIL Required ServiceElectronic Components Oil ChargeCooler Thermistor Locations Components for Part Number Plugging PlugsCooler Head Bolt Tightening Sequence Typical Tube Sheet Condenser CoilsDimension FAN Type Condenser Fan Adjustment Hz Low Noise Fan Option UnitsRefrigerant Feed Components Each circuit has Printed Circuit Board ConnectorThermistors Temperature Sensors Drop a 5K Thermistor Temperature F vs Resistance/VoltageDrop B 5K Thermistor Temperature C vs Resistance/Voltage Temp Voltage Resistance Drop 200,510 30GUN,R Units Pressure Switch Settings Psig kPaSwitch Cutout CUT-IN 30GTN,R UnitsSystem Check PRE-START-UPSTART-UP and Operation Temperature Limits for Standard UnitsTemperature Maximum Ambient Temperature 125Nominal and Minimum Cooler Fluid Flow Rates Field WiringRefrigerant Circuit Hgbps ALMCWP Energy Management Module EMM Wiring Compressor Expansion Board CXB Accessory Wiring Description Status Default Point Unit Configuration SettingsOPTIONS1 Options Configuration Description Status Default Units PointAppendix a CCN Tables OPTIONS2 Options ConfigurationAlarmdef Alarm Definition Table Brodefs Broadcast POC Definition Table Resetcon Temperature Reset and Demand LimitDescription Status Units Point Forceable Aunit General Unit ParametersCircaan Circuit a Analog Parameters Circadio Circuit a Discrete ParametersCircbdio Circuit B Discrete Parameters Circban Circuit B Analog ParametersOptions Unit Parameters Description Status Units Point StrthourCurrmods Description Status Units Point DefaultsDescription Status Point CSM/FSM Equipment Table Type 621H, BlockLine Description Point Cooler Fluid Pressure Drop Curves 30GUN,GUR040-110 Appendix B Fluid Drop Pressure CurvesCooler Pressure Drop KEY Appendix B Fluid Drop Pressure CurvesCooler Fluid Pressure Drop Curves 30GUN,GUR130-210 Appendix B Fluid Drop Pressure Curves Cooler Fluid Pressure Drop Curves 30GUN,GUR230B-315B Cooler Fluid Pressure Drop Curves 30GTN,GTR040-110 Cooler Fluid Pressure Drop Curves 30GTN,GTR130-210 Appendix B Fluid Drop Pressure Curves Module B 30GTN,GTR230,245 Module B 30GTN,GTR255,290,315 Call for Free Catalog Service TrainingEquipment Chiller Model no START-UP Checklist for Comfortlink Chiller SystemsRemove and use for job file Preliminary Information Preliminary Equipment Check Check box if complete UnitStart-Up System Fluid Volume in Loop Type SystemUnit Start-Up Baud Description Status Units Value CtrlCcna CcnbSlct Heating Cooling Setpoint Select CND.P RMT.A All Units

Air Conditioner specifications

Carrier Air Conditioners have long been synonymous with reliability and innovation in climate control. Founded by Willis Carrier, the inventor of modern air conditioning, the brand has continuously set industry standards through state-of-the-art technologies and features designed to enhance indoor comfort.

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In conclusion, Carrier air conditioners represent a perfect blend of cutting-edge technology, energy efficiency, and user comfort. Their emphasis on sustainability and smart features positions them as a leading choice for homeowners seeking reliable and innovative climate control solutions. Whether for cooling a small room or an entire house, Carrier remains a trusted name in air conditioning.
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